Carburetor



Patented Apr. 28, 1931 UNITED STATES PATENT OFFICE MAURICE GOUDARD, OF NEUILLY-SUR-SEINE, FRANCE, ASSIGNOR T SOCIETE ANONYME SOLEX, 0F NEUILLY-SUR-SEINE, FRANCE, A SOCIETY 0F FRANCE CARBURETOR Application filed November 20, 1929, Serial No. 408,635, and in Belgium December 4, 1928.

The present invention relates to carburetors and, more particularly, to those of the type provided' `with a pump intended to increase the supply of fuel during rapid acceleration.

In carburetors of the type referred to hereinabove, the pump actuated as a rule by movement of the throttle, is arranged to provide a supplementary fuel feed over and above that being supplied from the carburetor nozzle or nozzles by the aspirating action of the motor. l

One of the objects of the invention is to provide a pump-carburetor assembly in which the feed from the fuel nozzles due to the suction exerted thereon is entirely replaced by the feed from thepunrp duiing the period of rapid acceleration.

Another object is to provide a pump-carburetor assembly in which the pump and the carburetor nozzlesserve alternate automatically as fuel sources in accordance with the rate of movement of the throttle.

A further Objectis to provide a two part form of carburetor body assembly permitting easy access to, and repair of, the various operating elements.

A still'further object is to provide a form of assembly permitting the pump-carburetor assembly to be transformed quickly into an ordinary carburetor without pump.

Another object is to provide a form of assembly permitting easydetachment of the pump. Y Still other objects will appear in the course of the detailed description now to be given vwith reference to the accompanying drawing in which the single gure represents an elevation partially in section of one constructive embodiment of the invention.

Referring to the drawing, there is shown a carburetor body composed of an upper portion l'formed in one piece and comprising the mixing chamber-casing and venturi, the throttle and the cover for the constant level reservoir,and a lower one-piece portion 2 including a float chamber 3 provided with the usual float operated needle-valve, 1f. said float chamber communicating via a passage 4 with a vertical bore 5 feeding auxiliary nozzle 7 and main nozzle 8 of current design. Bore 5 terminates at its upper extremity in a calibrated orifice 6 and at its lower extremity in an assembly composed of a plug 10 threadedly engaging with an extension 9 of casting 2, said plug having a pair of transverse passages 19, 20 and a longitudinalbore l1 therein,-and a bell-shaped element 12 slidably mounted in bore 11 and having a longitudinal bore 13' formed therein terminating in an orifice 14. A casting 15-is supported between the head of plug 10 and casting 9 (proper plastic packing elements being intercalated to prevent leakage) and is provided with a passage 18 communicating at one extremity with orifice 19 or 20 and at its other extremity with the compression side of the pump. The latter is composed of4 a tube 16 interengaging with casting 15, a pis-A ton 21 resiliently supported between opposed springs 22, 23, and a tube 24 fitting telescopically over tube 16. A lever 25,- rigidly attached to "the throttle, transmits the movements of the latter to the end of tube 24.

The hereinabove described structure func- -tions in the following manner:

When the throttle is nearly closed, spring 22 lifts piston 21 and the elements thereabove upward and tube 16 fills with carburant via passages i8, 19, 13, 14,l 5 and 4, bell 12 remaining in lowered position and permitting carburantl to feed nozzles 7 and 8 via orifice 6; if now, the throttle is opened slowly, piston 21 will force the liquid therebelow through orifice 14 and the carburetor will function as if the pump were not attached thereto; if, contrariw'ise, the throttle is opened quickly, the rapid compression of the liquid in tube 16 will be transmitted to bell 12, the latter will move `upward into the position shown in dotted lines, its conical end willengage vin orifice 6, the flow of carburant via passages4 and 5,wi1l be cut ofi', and nozzles 7 and 8 will be fed exclusively from the pump; as soon as the pressureof the liquid in the pump falls to a point where bell 12 is no longer sustained, the latter will redescend to the position shown in full lines, and the feed of carburant tonozzles 7 and 8 v lorifice 6.

the bolt or bolts holding castings 1 and 2 together, the line of junction between the latter being chosen so as to give easy access tothe float chamber and the nozzles i. e. the line shown in the drawing. It is to be noted further that since lever is not connected to tube 24 but merely 'rests thereon, the unscrewing of plu 10 permits the entire pump assembly to be detached from the carburetor body. In' the event that thepump doesv not function properly for any reason, plug l0 may be` unscrewed (together with bell 12) and replaced by a plug not having oritices of the type 19, 20 therethrough, bell 12 being removed entirely. Communication between the pump and orifice being then cut oil", nozzles 7 and 8 will then function alone to supply fuel to the mixing chamber.

What I claim is 1. In a earburetora mixing chamber, a throttle positioned in said mixing chamber, a nozzle positioned to deliver carburant to said mixing chamber, a reservoir adapted to contain carburant, a first passage communieating at one extremity with said reservoir and, at its other extremity with said nozzle, a pump, a. second passage communicating at one extremity with said pump and, at its other extremity with said nozzle, and means actuable by the compressive 'action of said pump to cut olf communication between said nozzle and said first passage.

2. A structure as defined in claim 1, in combination with means operative by movement of the throttlel to actuate said pump.

3. In a carburetor,.a mixing chamber, a

nozzle positioned to deliver fuel to said mixing chamber, a fuel reservoir and a fuel pump provided with passages communicating with said nozzle, and means operative to cut ofi' communication between the nozzle and reservoir when the pump is supplying fuel to the nozzle.

4. In a. carburetor, a mixing chamber, a nozzle positioned to deliver fuel to said mixing chamber, a throttle controlling the mixing chamber, a fuel reservoir provided with a passage communicating with said nozzle, a compression pump communicating with said nozzle, and means operative to cut olf communication between the nozzle and the reserf, voir when the value of; the compression in said'pump reaches 'a predetermined value.V

5. A. structure as defined in claim 4, in

combination with means operative by. said throttle to actuate said pump.

6. In a carburetor, a mixing chamber, a

'throttle controlling said mixing chamber, a

nozzle positioned to deliver carburant to said mixing chamber, aA reservolr and a compression pump adapted to supply carburant, passages extending from said reservoir and said pump to said nozzle, said passages forming an angle with one another, a valve mounted in the passage leading to the pump and positioned to block the passage leading to the reservoir under the actionof the compressed carburant delivered by the pump, and means for transmitting movements of the throttle to the pump. i

7. In a carburetor, a mixing chamber, a throttle controlling the mixing chamber, a nozzle positioned to deliver carburant to the mixing chamber, a reservoir and a pump adapted to supply, carburant, passages eX-.

tending from the reservoir and the pump to said nozzle, said passages forming an angle with one another, a valve slidably mounted in the passage leading to the pump and positioned to move across the mouth of the pas-l sage leading to the reservoir, said valve being formed so as to offer a'limited resistance to the flow of carburant from the pump to the nozzle, and means for transmitting movements of the throttle to the pump.

8. In a pump carburetor assembly, a carburetor assembly unit comprising a iioat chamber, a mixing chamber, a throttle controlling the mixing chamber, a nozzle, a first passage extending between the nozzle and the float chamber, and a, second passage forming an angle with said first passage,-a fuel pump assembly unit comprising a pump and a conduit adap"ed to be connected to the carburetor assembly,-and means for maintaining said pump andv carburetor units in assembled relation comprising a plug traversing said conduit and threadedly engaging in said second passage, said plug carrying .valve means operative to cut oi communicationbetween the nozzle and said irst passage, upon operation of said pump.

In tesi imony whereof I attx my signature.

MAURICE GGUDARD. 

